This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 5 |
| 3 | 22 |
| 4 | 96 |
| 5 | 419 |
| 6 | 1819 |
| 7 | 7824 |
| 8 | 33302 |
| 9 | 140317 |
| 10 | 585873 |
| 11 | 2427146 |
| 12 | 9989068 |
| 13 | 40886295 |
| 14 | 166600967 |
| 15 | 676368388 |
| 16 | 2737758594 |
| 17 | 11055063953 |
| 18 | 44553867901 |
| 19 | 179280877950 |
| 20 | 720513441080 |
| 21 | 2892804682891 |
| 22 | 11605214879475 |
| 23 | 46528078138232 |